Thermal Barrier Coating and Turbulence Intensity Effects on Leading Edge Cooling Using Conjugate Heat Transfer Analysis

Prapamonthon, Prasert; Xu, Huazhao; Ke, Zhaoqing; Yang, Wenshuo; Wang, Jianhua

doi:10.1139/tcsme-2017-1017

Cited by 1 publication

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“…For the film-cooled vane with round holes, overall effectiveness was increased significantly by TBC, and the effect of the blowing ratio on the overall cooling effectiveness of the turbine vane with TBC was minimal. Prapamonthon et al [30,31] simultaneously studied the effects of Tu and TBC on the cooling performance of a leading-edge cooling guide vane and a real film-cooled vane, using 3D CHT analysis at Tu = 3.3%, 10%, and 20%. Their works indicated that TBC was more effective when the level of Tu increased.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Cooling Performances of a Non-Film-Cooled Turbine Vane Coated with a Thermal Barrier Coating Using Conjugate Heat Transfer

et al. 2018

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Abstract:The aim of this paper is to numerically investigate cooling performances of a non-film-cooled turbine vane coated with a thermal barrier coating (TBC) at two turbulence intensities (Tu = 8.3% and 16.6%). Computational fluid dynamics (CFD) with conjugate heat transfer (CHT) analysis is used to predict the surface heat transfer coefficient, overall and TBC effectiveness, as well as internal and average temperatures under a condition of a NASA report provided by Hylton et al. [NASA CR-168015]. The following interesting phenomena are observed: (1) At each Tu, the TBC slightly dampens the heat transfer coefficient in general, and results in the quantitative increment of overall cooling effectiveness about 16-20%, but about 8% at the trailing edge (TE). (2) The protective ability of the TBC increases with Tu in many regions, that is, the leading edge (LE) and its neighborhoods on the suction side (SS), as well as the region from the LE to the front of the TE on the pressure side (PS), because the TBC causes the lower enhancement of the heat transfer coefficient in general at the higher Tu. (3) Considering the internal and average temperatures of the vane coated with two different TBCs, although the vane with the lower thermal conductivity protects more effectively, its role in the TE region reduces more significantly. (4) For both TBCs, the increment of Tu has a relatively small effect on the reduction of the average temperature of the vane.

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Section: Introductionmentioning

confidence: 99%